name : start-lifecycle-policy-preview.rst **To create a lifecycle policy preview** The following ``start-lifecycle-policy-preview`` example creates a lifecycle policy preview defined by a JSON file for the specified repository. :: aws ecr start-lifecycle-policy-preview \ --repository-name "project-a/amazon-ecs-sample" \ --lifecycle-policy-text "file://policy.json" Contents of ``policy.json``:: { "rules": [ { "rulePriority": 1, "description": "Expire images older than 14 days", "selection": { "tagStatus": "untagged", "countType": "sinceImagePushed", "countUnit": "days", "countNumber": 14 }, "action": { "type": "expire" } } ] } Output:: { "registryId": "012345678910", "repositoryName": "project-a/amazon-ecs-sample", "lifecyclePolicyText": "{\n \"rules\": [\n {\n \"rulePriority\": 1,\n \"description\": \"Expire images older than 14 days\",\n \"selection\": {\n \"tagStatus\": \"untagged\",\n \"countType\": \"sinceImagePushed\",\n \"countUnit\": \"days\",\n \"countNumber\": 14\n },\n \"action\": {\n \"type\": \"expire\"\n }\n }\n ]\n}\n", "status": "IN_PROGRESS" }